[Mojo Video Capture] Create abstraction VideoCaptureProvider

content/browser/renderer_host/media/in_process_video_capture_provider.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CONTENT_BROWSER_RENDERER_HOST_MEDIA_IN_PROCESS_VIDEO_CAPTURE_SYSTEM_H_
+#define CONTENT_BROWSER_RENDERER_HOST_MEDIA_IN_PROCESS_VIDEO_CAPTURE_SYSTEM_H_
+
+#include "base/memory/ptr_util.h"
+#include "base/memory/ref_counted.h"
+#include "content/browser/renderer_host/media/video_capture_provider.h"
+#include "media/capture/video/video_capture_system.h"
+
+namespace content {
+
+class CONTENT_EXPORT InProcessVideoCaptureProvider
+    : public VideoCaptureProvider {
+ public:
+  InProcessVideoCaptureProvider(
+      std::unique_ptr<media::VideoCaptureSystem> video_capture_system,
+      scoped_refptr<base::SingleThreadTaskRunner> device_task_runner);
+  ~InProcessVideoCaptureProvider() override;
+
+  void GetDeviceInfosAsync(
+      const base::Callback<void(
+          const std::vector<media::VideoCaptureDeviceInfo>&)>& result_callback)
+      override;
+
+  std::unique_ptr<BuildableVideoCaptureDevice> CreateBuildableDevice(
+      const std::string& device_id,
+      MediaStreamType stream_type) override;
+
+ private:
+  const std::unique_ptr<media::VideoCaptureSystem> video_capture_system_;
+  // The message loop of media stream device thread, where VCD's live.
+  scoped_refptr<base::SingleThreadTaskRunner> device_task_runner_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_IN_PROCESS_VIDEO_CAPTURE_SYSTEM_H_